Gorgonian coral and Red coral

Gorgonian coral noun - Corals having a horny or calcareous branching skeleton.

Red coral and gorgonian coral are semantically related. In some cases you can replace phrase "Red coral" with "Gorgonian coral", this phrases are similar.

Red coral noun - Corals of especially the Mediterranean having pink or red color used for ornaments and jewelry.

Gorgonian coral and red coral are semantically related. You can use "Gorgonian coral" instead a noun phrase "Red coral".